Free BMI Calculator
Easily calculate your Body Mass Index to determine your healthy weight range.
What is BMI?
Body Mass Index (BMI) is a value derived from the mass (weight) and height of a person. It is a simple, inexpensive, and non-invasive screening tool to determine if a person’s body weight is in a healthy proportion to their height. A BMI score can help you understand your risk for certain weight-related health issues.
Our free online BMI calculator provides you with a quick and reliable way to check your BMI score. Simply enter your height and weight in the form on the right, and we'll calculate your BMI and tell you which category you fall into.
Why Calculate Your BMI?
- It's a great starting point for assessing your health.
- It helps you understand if you are at a healthy weight for your height.
- It can be a motivator to start a healthy diet or fitness plan.
- It's a useful tool for tracking your progress on a weight loss or weight gain journey.
Trusted Health Sources
For more in-depth, authoritative information on BMI and its implications, please refer to these trusted organizations:
Calculate Your BMI
Understanding Your BMI Score
After using our tool, your result will fall into one of the following categories, based on standard classifications.
Underweight
BMI below 18.5
This may indicate you are not getting enough nutrients. Consider consulting a professional to explore a healthy weight gain plan.
Normal Weight
BMI 18.5 - 24.9
Congratulations! Your weight is in a healthy range. Continue to maintain a balanced diet and regular exercise.
Overweight
BMI 25.0 - 29.9
Being in this range may increase your risk for health issues. A modest weight loss can lead to significant health benefits.
Obesity
BMI 30.0 and above
This category increases your risk for chronic diseases. We strongly recommend consulting a healthcare provider to discuss a safe and effective plan.
Frequently Asked Questions
BMI is a general screening tool and may not be accurate for everyone. For example, athletes with a high muscle mass may have a high BMI without being overweight. Likewise, older adults who have lost muscle mass may have a normal BMI but be carrying excess body fat. It's best used as a general indicator of health.
BMI is calculated using a simple formula: weight in kilograms divided by the square of height in meters ($$kg/m^2$$). Our calculator does this for you automatically when you input your measurements in centimeters and kilograms.
Absolutely. While BMI can be a helpful guide, it does not measure body fat directly. For a full health assessment and personalized advice, it is always recommended to speak with a healthcare professional or a registered dietitian who can consider other factors like body composition, waist circumference, and family history.
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